Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d03ca3302de98d85…

MALICIOUS

RTF / .DOC

16.5 KB First seen: 2022-10-17
MD5: 0e00253e7a976060b3218801f6497847 SHA-1: 773927e12c5ebe72198fd2213bdbea586fdaabf8 SHA-256: d03ca3302de98d854b3f294cd74b43b93870704a26baacce7f3f5bddf1ff056a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is activated, typically through the \objupdate directive. The embedded object's structure and entropy suggest it contains a second-stage payload. The specific CLSID and stream name indicate the use of the Ole10Native format for embedding.

Heuristics 6

  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000077c.bin
57abf29c5a37d49028aa01ea122c7cff6b53496a76f4be03112f2349151f5598		 rtf-objdata-decoded RTF \objdata at offset 0x77C 4171 bytes

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